example 8

example_8.rb

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+require 'javalib/jena-2.6.4.jar'
+require 'javalib/arq-2.8.7.jar'
+require 'javalib/icu4j-3.4.4.jar'
+require 'javalib/iri-0.8.jar'
+require 'javalib/log4j-1.2.13.jar'
+require 'javalib/lucene-core-2.3.1.jar'
+require 'javalib/slf4j-api-1.5.8.jar'
+require 'javalib/slf4j-log4j12-1.5.8.jar'
+require 'javalib/stax-api-1.0.1.jar'
+require 'javalib/wstx-asl-3.2.9.jar'
+require 'javalib/xercesImpl-2.7.1.jar'
+require 'java'
+
+java_import 'com.hp.hpl.jena.rdf.model.ModelFactory'
+java_import 'com.hp.hpl.jena.rdf.model.SimpleSelector'
+java_import 'com.hp.hpl.jena.util.FileManager'
+java_import 'com.hp.hpl.jena.vocabulary.VCARD'
+java_import 'java.io.InputStream'
+
+#Creating a model 
+m = ModelFactory.create_default_model
+
+#Finding the input file using the Jena File Manager
+input_file = FileManager.get.open "sample_input.rdf"
+
+#read the RDF/XML file
+m.read(input_file, nil)
+
+#select all the resources with a VCARD.FN property
+iter = m.list_resources_with_property VCARD::FN
+puts "The database contains vcards for:"
+while iter.has_next
+  puts iter.next_resource.get_required_property(VCARD::FN).get_string
+end
+
+#select all the resources with a VCARD.FN property whose value ends
+#with Smith
+
+class MySelector < SimpleSelector
+  def selects(statement)
+    if statement.get_string.include?("Smith")
+      return true
+    else
+      return false
+    end
+  end
+end
+
+
+selector = MySelector.new(nil, VCARD::FN, nil)
+
+iter = m.list_statements(selector)
+puts "When using a selector for Smith we get:"
+while iter.has_next
+  puts iter.next_statement.get_string
+end
+
+
+
+
+
+
+
+
+